Sensors attached to the blimp are able to detect anything
from cruise missiles and rockets to approaching tanks from
hundreds of miles away.

The Army, in conjunction with U.S. Northern Command, will
be conducting tests with the JLENS at Aberdeen Proving ground in
Maryland. They are reportedly experimenting with affordable
domestic missile shield technology.

JLENS can reach an altitude of 10,000 feet and stay aloft
for 30 days at a stretch, and its 360 degree sensor package can
scan the air, land, and sea for up to 340 miles,according to DefenseNews.